I think testing to verify the oil life monitor might be a good idea ad then see where that leads. I never tested but always changed at 5k intervals with synthetic assuming I'm probably still too early but to be safe....
Never heard of Donaldson filters. I'll have to look them up. Not to turn this into an oil thread but the local amsoil guys truck was in my brothers shop a few years back for a motor job. It was a Ram with a 360. Ever since then I've steered clear of Amsoil products.

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